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2017roadiron-cruiser_en

703 “For the serious engine builder” These superb valves feature the highest flow level on the market. They are piece forged from a racing grade stainless steel alloy and they receive a special heat treatment and nitrided process to improve wear properties and reduce friction. This results in incomparable performance and longer valve life. The Black Tulip Valves TM design also feature a 45° angle below the lock groove to reduce the stress in this area and to facilitate the valve seal installation. valve type diameter Length Stem Diameter notes Evolution Big Twin and Twin Cam (5/16 Stem) 53-2000D Exhaust 1.610” 4.525” .3106” Black valve 53-2174 Exhaust 1.650” 4.490” .3106” Black valve (oversize valve for Jims 120 & SE 110 Heads) 53-2003 Intake 1.940” 4.440” .3108” Black valve 53-2255 Intake 1.990” 4.440” .3108” Black valve 53-2004A Intake 2.020” 4.440” .3108” Black valve (for merch heads or other) Evolution Sportster 883 to 1200 Conversion (5/16 Stem) 53-2005 Exhaust 1.480” 4.640” .3106” Black valve (Seats must be machined deeper and their ID must be enlarged to accept these valves) 53-2006 Intake 1.720” 4.560” .3108” Black valve (Seats must be machined deeper and their ID must be enlarged to accept these valves) S&S® Heads 53-2170 Exhaust 1.610” 4.565” .3106” Black valve 53-2171 Intake 2.020” 4.510” .3108” Black valve Sportster 1200 & Buell (5/16 stem) 53-2167 Exhaust 1.485" 4.560” .3106" 53-2168 Intake 1.720" 4.480” .3108" Sportster 1200 & Buell XB9/XB12 (7mm stem) 53-2521 Exhaust 1.575" 4.620" 7mm Black valve also good for stock replacement, triple groove valve 53-2522 Intake 1.810" 4.480" 7mm Black valve also good for stock replacement, triple groove valve Twin Cam (7mm stem, Triple Groove) 53-2516 Exhaust 1.575" 4.555" .2755" Black valve 53-2517 Exhaust 1.610" 4.555" .2755" Black valve, 035" overs valve 53-2518 Intake 1.810" 4.555" .2757" Black valve 53-2519 Intake 1.850" 4.555" .2757" Black valve, 040" overs valve


2017roadiron-cruiser_en
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